JPH01156127A - Cabriolet with wind shield - Google Patents

Abstract

PURPOSE: To effectively decelerate an air flow impinging from rear side in a vehicle running direction by forming a windscreen extending over the whole width of an internal space, arranged behind a row of seats. CONSTITUTION: This windscreen 2, which is erected behind the seat 1 of an cabriolet, is formed out of a stretched elastically deformable net having a plurality of passing holes 3. As a result, air flow coming in an arrowhead 4 direction is strongly decelerated as shown by a parallel small arrowhead 5 through the passing holes 3. The windscreen 2 is preferably formed so as to terminate at the height of the upper edge of a front side window 6 delivered completely and extend downward up to the floor of a vehicle.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Sedentary Use] The present invention provides a windshield provided in the diameter of the seat row and extending upwardly beyond this seat row and extending over the entire width of the interior space. Regarding Cabriolet.

BACKGROUND OF THE INVENTION Such a windshield for a cabriolet is already known from German Utility Model No. 8617748. Transparent window glass is used here, but since it does not allow air to pass through, it provides only a mediocre windshield.

According to U.S. Pat. No. 3,749,147, a fine mesh lattice is placed on the outside of the ordinary window glass, which can be lowered in some cases, to prevent insects and dust from entering the interior space of the vehicle, and at the same time in case of severe diarrhoea. It has been proposed to prevent too strong a temperature rise in the vehicle interior space.

[Problem to be solved by the invention]

The idea underlying the invention is to improve the windshield of the first type mentioned so as to avoid heavy drafts but maintain the typical Cabriolet feel.

[Means to solve the problem]

In order to solve this problem, according to the invention, the windshield is stretched and formed by an elastically deformable net, which decelerates the airflow that hits it later.

〔Effect of the invention〕

The special effect of the windshield according to the invention is due to the following circumstances. That is, a strong negative pressure is created in the interior space of the cabriolet while the vehicle is running, producing noisy air vortices, and these air vortices are felt as bothersome draft air. Regarding this situation, the known windshield according to German Utility Model No. 8617748 is no different. On the other hand, with the windshield according to the present invention, the negative pressure is compensated for by J&, so that the annoyance caused by noise is eliminated, and the remaining draft air is only felt as a light breath.

Particularly advantageous developments of the invention are evident from the further claims.

〔Example〕

The invention will be explained below by means of an example shown in the drawings.

As can be seen from FIG. 1 of the drawings, a compatible windshield 2 is provided behind the seat l of the cabriolet shown and has a number of passage holes 3 so that the air flow arriving in the direction of the arrow 4 can As shown by small parallel arrows 5, the speed is strongly decelerated by the passage hole 3. This reduced air flow is no longer perceived as a nuisance by the vehicle user.

The windshield 2 ends at the level of the upper edge of the fully extended front side window 6 and extends downwards to the floor of the vehicle.

For the sake of clarity, the illustration is greatly simplified here, but the windshield 2 is comprised of a net that is held in a frame and bends or bulges forward when a suitable pressure is applied from behind.

The embodiment according to FIG. 2 of the drawings corresponds in principle to that of FIG. 7 is provided. Both parts 7a, 7b are connected via a hinge 8.

The embodiment according to FIG. 3 has a two-part windshield 9, the upper part 9a of which stands above the lateral edge of the vehicle, and the lower part 9b of which is arranged horizontally approximately at the height of the lateral edge of the vehicle.

FIG. 4 of the drawings shows another embodiment of the invention. Here, a frame 10 is provided that projects upwardly beyond the side edge of the vehicle, and is pivotally connected to the vehicle via a hinge II. The actual windshield is here formed by a handle 12 stretched over a frame, the lower edge of which is preferably removably attached to the vehicle body at the level of the vehicle's side edges. The frame 10 is stirred up laterally by a closed side window glass 6.

In order to avoid disturbing noises during driving, the frame 13 can be constructed as an extruded profile with an oblong cross-section, as shown in FIG. 3 of the drawings.

In order to attach the mesh 14 to the frame 13, the edge area of this mesh is connected to a cord 15 with serrations, which cord is attached to the frame 13.
can be pushed into the pocket 16 and held there.

Finally, Figure 6 of the drawings shows in diagrams the actual results of nets with different elasticities, where the concave line 1 is a polyamide net, the curve 2 is a net made of a material commercially available under the name elastane, 177
1!3 also concern a 20% pre-stretched net made of elastane. In this diagram, ζ is the low loss coefficient,
θL is the air density, ■ is the air velocity, Δ is the pressure difference before and after the mesh, i is the mass flow ftk (kg/h), and c is the average air velocity (m/S).

The use of nets whose drop coefficient lies in the range between curves 1 and 2 is particularly advantageous.

It is clear from this diagram that as the inlet velocity increases, the resistance decreases, which is due in particular to the elastic stretching of the mesh. Changes in elasticity are possible depending on the material used and the way the mesh is folded.

The windshield according to the invention thus has an appropriate air permeability that is adapted to the geometrical conditions of the respective vehicle or to the arrangement of the windshield in order to provide adequate draft protection. This suitable air permeability is obtained by the use of different mesh materials or woven materials with different meshes (for example a mesh side length of 0.5 mm).

Due to its inherent elasticity, the windshield equalizes the subsequent airflow, eliminates turbulence, and reduces air velocity to maintain low sound levels in the interior of the vehicle without bothersome pulsations. ,It is configured.

In particular, due to the elasticity of the mesh, it stretches when turbulent air hits it, automatically increasing the air permeability.

This variable air permeability, which allows the increasing negative pressure in the interior space to be compensated by a large air flow as the vehicle speed increases, allows constant draft protection over the entire speed range of the vehicle.

[Brief explanation of the drawing]

Fig. 1 is a schematic side view of a cabriolet with a windshield installed upright behind the seat, Fig. 2 is a side view of an embodiment in which the upper part of the windshield can be folded back, and Fig. 3 4 is a side view of a cabriolet with a windshield consisting of an upright upper part and an almost horizontal lower part below it;
Figure 5 is a side view of a cabriolet with another mesh windshield attached to the frame; Figure 5 is a perspective view showing a cross section of the windshield frame;
The figure is a diagram showing the flow conditions in nets of different elongations. 1---Seat, 2; 7a, 7b; 9a+ 9b;
12-.-Wind shield, 4... Air flow. Enter, D

Claims (1)

[Scope of Claims] 1. A windshield that is provided after a row of seats and extends upward beyond the row of seats and extends across the entire width of the interior space, where the windshield is stretched and can be elastically deformed. A cabriolet with a windshield that is formed by a windshield that slows down the airflow that hits it from behind. 2. Cabriolet according to claim 1, characterized in that the windshield is provided upright or slightly inclined forward. 3 Frame (10; 1) that holds the windbreak net (12; 14)
3). Cabriolet according to claim 1, characterized in that it has: 4. Cabriolet according to at least one of claims 1 to 3, characterized in that the windscreen is configured to allow rear visibility. 5. Cabriolet according to at least one of claims 1 to 4, characterized in that the windshield (7, 9) consists of several parts that are hinged or bayonet connected. 6. The cabriolet according to at least one of claims 1 to 5, characterized in that a plurality of windshields are provided in the longitudinal direction of the vehicle at intervals from each other. 7. Cabriolet according to at least one of claims 1 to 6, characterized in that the windshield (7) is foldable over at least part of its height rearwardly into an inoperative position. 8. Cabriolet according to at least one of the preceding claims, characterized in that the windshield (2, 7) extends downwards to the floor of the vehicle. 9. A substantially horizontal screened portion (9b) whose lower edge ends approximately at the level of the vehicle side edge and which closes the rear opening of the seat (1) to the rear. Cabriolet according to at least one of claims 1 to 8, characterized in that the cabriolet has a transition to ). 10. At least one of claims 1 to 9, characterized in that the cabriolet has a rigid or swingable roll bar that is laterally closed with side window glass, and is provided with a roll-up blind configured as a windshield. Cabriolet as described in. 11. Cabriolet according to at least one of claims 1 to 10, characterized in that the frame (13) has an oblong cross section. 12 4 to 40% when the net is under a tensile load of 10N
Cabriolet according to at least one of the preceding claims, characterized in that it has an elongation of .